I know this is an old thread, but the poster is right. You can buy the spring ($.60) at ACE. You can also buy the necessary 10-24 thread set screw there (($.30). I bought several lengths of these set screws in both hex and slotted configurations.
Yes, the set screw eliminates the huge overtravel of the trigger when the sear releases and does NOT interfere with bolt removal.
I 'upset' the threads of the screw just enough to prevent it from moving and a add a bit of Loctite.
Done it to all 6 Axis rifles.

ron